Less distracting "Are you on the wrong stack?" warning

What was the issue:
The previous “Are you on the wrong stack?” warning was too distracting when the error was not related to the stack. We wanted this warning to be highlighted enough, as this was quite a frequent issue with new Xcode versions (when you forgot to switch the stack to the new Xcode version’s stack), but at the same time it shouldn’t be too distracting when the error is not stack related.

How it worked before:

What we changed to make it better:
We changed the design just a little bit, to make it look like a warning and not an error.